NDLI: An Investigation of Diffusion in Droplets and of Evaporation of Volatile Components into Vacuum

Content Provider	Springer Nature Link
Author	Pomarev, A. N.
Copyright Year	2005
Abstract	A numerical investigation is performed of the dynamics of diffusion in droplets and of free-molecule evaporation into vacuum of volatile components of magnesium (Mg) and zinc (Zn) from aluminum alloys. The calculations are performed in application to the conditions of my experiments in high-frequency droplet formation under conditions of centrifugal dispersion in vacuum of rotating (overloads of 70–4000) blanks by the melting method under the effect of a concentrated energy source. In view of analogy between mass transfer and heat transfer, available solutions are used in heat transfer under convection cooling of bodies with boundary conditions of the third kind. It is demonstrated that the numerical values of Biot diffusion criteria (Bi) are functions of the properties of alloy components and do not depend on the initial content of volatile components. At the droplet temperature T = 1000 K and radius R = 0.25× 10−3 m, the Biot number is Bi = 14.8 for alloying systems Al-Mg and Bi = 74.4 for Al-Zn. The solution demonstrates that the diffusion resistance within droplets causes a several-fold decrease (compared to the initial value) in the transfer of the mass of volatile component to the droplet surface (with a decrease in the flow of vapors) even for the given short time of droplet flight τ = 0.01 s corresponding to the value of the Fourier criterion Fo = Dτ/R 2 = = 1.2×10−3. The final depletion of the composition of droplets of magnesium, which is estimated relative to its permissible content in the alloy according to GOST (State Standard), is about 0.07% for a D16 alloy with a wide range of variation of Mg content from 1.2 to 1.8% by mass, which may be regarded as insignificant. For an AMg6 alloy with a smaller range of variation of Mg content from 5.8 to 6.8%, the depletion is about 0.2%, which may be regarded as appreciable.
Starting Page	930
Ending Page	936
Page Count	7
File Format	PDF
ISSN	0018151X
Journal	High Temperature
Volume Number	43
Issue Number	6
e-ISSN	16083156
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Materials Science Mechanics, Fluids, Thermodynamics Atoms and Molecules in Strong Fields, Plasma Physics
Content Type	Text
Resource Type	Article
Subject	Engineering Condensed Matter Physics

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